Continuity equations for the classical Euclidean two-dimensional non-linear [sigma]-models Eichenherr, H. Pohlmeyer, K. 1977 - DESY EPflicht - frei zugänglich
Scattering of massless lumps and non-local charges in the two-dimensional classical non-linear [sigma]-model Lüscher, M. Pohlmeyer, K. 1977 - DESY EPflicht - frei zugänglich